CN113432237B - Method, device and air conditioner for judging completion of refrigerant recovery - Google Patents

Abstract

The invention provides a method, a device and an air conditioner for judging the completion of refrigerant recovery, and relates to the technical field of air conditioners. The judging method includes: acquiring the indoor ambient temperature, and determining the first determination condition and the second determination condition according to the indoor ambient temperature; acquiring the initial weight of the outdoor unit before the refrigerant recovery starts, and determining the third determination condition according to the initial weight; acquiring the indoor unit The initial outlet air temperature at the start of refrigerant recovery, and the real-time outlet air temperature during the refrigerant recovery process; when the indoor ambient temperature, initial outlet air temperature and real-time outlet air temperature meet the first judgment condition, control the indoor unit to lower Wind speed; when the real-time outlet air temperature before and after the reduction of the wind speed meets the second judgment condition, obtain the real-time weight of the outdoor unit; when the real-time weight and the initial weight meet the third judgment condition, determine that the refrigerant recovery is complete . The judgment method provided by the invention can accurately judge whether the refrigerant is recovered cleanly.

Description

Method, device and air conditioner for judging completion of refrigerant recovery

technical field

The invention relates to the technical field of air conditioners, and in particular, to a method, a device and an air conditioner for judging the completion of refrigerant recovery.

Background technique

When producing an air conditioner, the manufacturer will conduct a trial operation test on the air conditioner on the production line. After the trial operation test is completed, the refrigerant needs to be recycled into the outdoor unit of the air conditioner. At present, the production line mainly judges the air conditioner by means of pressure detection. Check whether the refrigerant of the unit has been fully recovered to the outdoor unit.

Since there are many kinds of refrigerants on the market, such as R410A, R32, R290, R22, etc., the recovery pressures corresponding to different refrigerants are different, and the pressure detection method is easy to misjudge.

SUMMARY OF THE INVENTION

The problem solved by the present invention is that the existing pressure detection method is prone to misjudgment.

In order to solve the above problems, the present invention provides a method for judging the completion of the refrigerant recovery, which can accurately determine whether the refrigerant is recovered cleanly.

An embodiment of the present invention provides a method for judging the completion of refrigerant recovery, which is applied to an air conditioner. The judging method includes:

acquiring an indoor ambient temperature, and determining a first determination condition and a second determination condition according to the indoor ambient temperature;

Obtain the initial weight of the outdoor unit before the refrigerant recovery starts, and determine the third judgment condition according to the initial weight;

Obtain the initial outlet air temperature of the indoor unit at the beginning of refrigerant recovery, and the real-time outlet air temperature during refrigerant recovery;

In the case that the indoor ambient temperature, the initial outlet air temperature, and the real-time outlet air temperature satisfy the first determination condition, controlling the indoor unit to reduce the fan speed;

Obtaining the real-time weight of the outdoor unit under the condition that the real-time outlet air temperature before and after the reduction of the rotational speed of the wind gear satisfies the second determination condition;

When the real-time weight and the initial weight satisfy the third determination condition, it is determined that the refrigerant recovery is completed.

In the method for judging the completion of refrigerant recovery provided by the embodiment of the present invention, the first judgment condition and the second judgment condition are determined according to the indoor ambient temperature, and the third judgment condition is determined according to the initial weight of the outdoor unit before the refrigerant recovery starts. When the multiple parameters before and after satisfy the three determination conditions, it is determined that the refrigerant in the indoor unit has been completely recovered into the outdoor unit, that is, it is determined that the refrigerant recovery is complete. It can be seen that the method for judging the completion of refrigerant recovery provided by the present embodiment judges the completion of refrigerant recovery by judging multiple parameters before and after refrigerant recovery under different working conditions. The pressure change situation is judged, and the judgment result is more accurate and reliable.

In an optional implementation manner, the steps of acquiring the indoor ambient temperature and determining the first determination condition and the second determination condition according to the indoor ambient temperature include:

obtaining the indoor ambient temperature;

comparing the indoor ambient temperature with a plurality of preset temperature intervals;

The first determination condition and the second determination condition corresponding to the temperature interval in which the indoor ambient temperature is located are selected.

In an optional implementation manner, the step of acquiring the initial weight of the outdoor unit before the start of refrigerant recovery, and determining the third determination condition according to the initial weight includes:

Obtain the initial weight of the outdoor unit before the start of refrigerant recovery;

comparing the initial weight with a plurality of preset weight intervals;

The third determination condition corresponding to the weight interval in which the initial weight is located is selected.

In an optional implementation manner, the indoor unit is controlled to reduce the fan speed when the indoor ambient temperature, the initial outlet air temperature, and the real-time outlet air temperature satisfy the first determination condition The steps include:

If the value of the real-time outlet air temperature minus the initial outlet air temperature is greater than or equal to the first preset value, and the value of the indoor ambient temperature minus the real-time outlet air temperature is less than or equal to the second preset value , the indoor unit is controlled to reduce the fan speed.

In an optional implementation manner, the step of acquiring the real-time weight of the outdoor unit under the condition that the real-time outlet air temperature before and after the reduction of the wind gear rotational speed meets the second determination condition includes:

If the value of the real-time outlet air temperature before the reduction of the wind speed speed minus the real-time outlet air temperature after the reduction of the wind speed speed is less than or equal to a third preset value, obtain the real-time air temperature of the outdoor unit. weight.

In an optional embodiment, when the real-time weight and the initial weight satisfy the third determination condition, the step of determining that the refrigerant recovery is completed includes:

If the ratio of the real-time weight minus the initial weight to the initial weight is less than or equal to a fourth preset value, it is determined that the refrigerant recovery is complete.

The embodiment of the present invention also provides a judging device for the completion of refrigerant recovery, which is applied to an air conditioner, and the judging device includes:

The acquisition module is used to acquire the indoor ambient temperature, and determine the first judgment condition and the second judgment condition according to the indoor ambient temperature; the acquisition module is also used to acquire the initial weight of the outdoor unit before the refrigerant recovery starts, and according to the The initial weight determines a third judgment condition; the acquisition module is further configured to acquire the initial outlet air temperature of the indoor unit at the start of refrigerant recovery, and the real-time outlet air temperature during the refrigerant recovery process;

a control module, configured to control the indoor unit to reduce the speed of the wind gear when the indoor ambient temperature, the initial outlet air temperature and the real-time outlet air temperature satisfy the first determination condition;

The obtaining module is further configured to obtain the real-time weight of the outdoor unit under the condition that the real-time outlet air temperature before and after the reduction of the wind speed speed meets the second determination condition;

A determination module, configured to determine that refrigerant recovery is complete when the real-time weight and the initial weight satisfy the third determination condition.

The device for judging the completion of refrigerant recovery provided by the embodiment of the present invention determines the first judgment condition and the second judgment condition according to the indoor ambient temperature, and determines the third judgment condition according to the initial weight of the outdoor unit before the refrigerant recovery starts. When the multiple parameters before and after satisfy the three determination conditions, it is determined that the refrigerant in the indoor unit has been completely recovered into the outdoor unit, that is, it is determined that the refrigerant recovery is complete. It can be seen that the device for judging the completion of refrigerant recovery provided by this embodiment judges the completion of refrigerant recovery by judging multiple parameters before and after refrigerant recovery under different working conditions. The pressure change situation is judged, and the judgment result is more accurate and reliable.

In an optional implementation manner, the first determination condition includes:

The value of the real-time outlet air temperature minus the initial outlet air temperature is greater than or equal to a first preset value, and the value of the indoor ambient temperature minus the real-time outlet air temperature is less than or equal to a second preset value.

In an optional implementation manner, the second determination condition includes:

The value of the real-time outlet air temperature before the reduction of the wind gear rotational speed minus the real-time outlet air temperature after the reduction of the wind gear rotational speed is less than or equal to a third preset value.

In an optional implementation manner, the third determination condition includes:

A ratio of the real-time weight minus the initial weight to the initial weight is less than or equal to a fourth preset value.

An embodiment of the present invention further provides an air conditioner, including a controller, where the controller is configured to execute the judging method, and the judging method includes: acquiring an indoor ambient temperature, and determining a first judgment according to the indoor ambient temperature condition and the second judgment condition; obtain the initial weight of the outdoor unit before the start of refrigerant recovery, and determine the third judgment condition according to the initial weight; the real-time outlet air temperature; in the case that the indoor ambient temperature, the initial outlet air temperature and the real-time outlet air temperature satisfy the first judgment condition, control the indoor unit to reduce the fan speed; In the case that the real-time outlet air temperature before and after the reduction of the wind speed speed meets the second determination condition, obtain the real-time weight of the outdoor unit; in the case where the real-time weight and the initial weight satisfy the third determination condition In this case, it is determined that the refrigerant recovery is completed.

In the air conditioner provided by the embodiment of the present invention, the first determination condition and the second determination condition are determined by the indoor ambient temperature, the third determination condition is determined by the initial weight of the outdoor unit before the refrigerant recovery starts, and a plurality of parameters before and after the refrigerant recovery starts When the three determination conditions are satisfied, it is determined that the refrigerant in the indoor unit has been completely recovered into the outdoor unit, that is, it is determined that the refrigerant recovery is complete. It can be seen that the air conditioner provided in this embodiment judges the completion of the refrigerant recovery through multi-condition determination of multiple parameters before and after refrigerant recovery under different working conditions. Compared with the prior art, it is determined by a single pressure change. , the judgment result is more accurate and reliable.

Description of drawings

1 is a flow chart of a method for determining the completion of refrigerant recovery provided by an embodiment of the present invention;

Fig. 2 is a kind of sub-step flow chart of step S101 in Fig. 1;

Fig. 3 is a kind of sub-step flow chart of step S102 in Fig. 1;

Fig. 4 is a kind of sub-step flow chart of step S104 in Fig. 1;

Fig. 5 is a kind of sub-step flow chart of step S105 in Fig. 1;

Fig. 6 is a kind of sub-step flow chart of step S106 in Fig. 1;

FIG. 7 is a structural block diagram of an apparatus for determining the completion of refrigerant recovery provided by an embodiment of the present invention.

Description of reference numbers:

100 - a device for judging the completion of refrigerant recovery; 110 - an acquisition module; 120 - a control module; 130 - a determination module.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Please refer to FIG. 1 . FIG. 1 shows a flowchart of a method for judging the completion of refrigerant recovery provided by this embodiment. The method for judging the completion of refrigerant recovery determines the completion of refrigerant recovery by judging multiple parameters before and after refrigerant recovery under different working conditions. The results are more accurate and reliable. The method for judging the completion of refrigerant recovery provided by this embodiment includes the following steps:

In step S101, the indoor ambient temperature is acquired, and the first determination condition and the second determination condition are determined according to the indoor ambient temperature.

Please refer to FIG. 2. FIG. 2 shows a flowchart of a sub-step of step S101. Step S101 may include:

Sub-step S1011, acquiring the indoor ambient temperature.

In this embodiment, the indoor ambient temperature is detected by installing a temperature sensing package on the indoor unit of the air conditioner.

Sub-step S1012, comparing the indoor ambient temperature with a plurality of preset temperature ranges.

In this embodiment, the preset temperature interval includes: [50°C, +∞), [40°C, 50°C), [30°C, 40°C), and [20°C, 30°C).

Sub-step S1013, select the first judgment condition and the second judgment condition corresponding to the temperature range in which the indoor ambient temperature is located.

In this embodiment, the first judgment condition and the second judgment condition corresponding to each temperature interval are as follows:

In the table, the initial outlet air temperature refers to the outlet air temperature of the indoor unit at the start of refrigerant recovery, and the real-time outlet air temperature refers to the real-time outlet air temperature of the indoor unit during the refrigerant recovery process.

For example, when the detected indoor ambient temperature is in the range of [20°C, 30°C), the selected first judgment condition is: the value of the real-time outlet air temperature of the indoor unit minus the initial outlet air temperature is greater than or equal to 2, and The value of the indoor ambient temperature minus the real-time outlet air temperature is less than or equal to 1. The second determination condition is selected as follows: the value of the real-time outlet air temperature before the reduction of the speed of the wind gear minus the real-time outlet temperature after the reduction of the rotational speed of the wind gear is less than or equal to 4.

It can be understood that the process of air conditioner refrigerant recovery is as follows: while the air conditioner is operating in the cooling mode, the fan of the outdoor heat exchanger is turned on, the liquid side stop valve is closed, and the compressor removes the refrigerant in the indoor heat exchanger and its connecting pipelines. Compressed discharge into outdoor heat exchanger. When the air conditioner operates at different ambient temperatures, the load of the air conditioner will be different, and the outlet air temperature of the air conditioner will also be different. The higher the ambient temperature, the higher the outlet air temperature. Therefore, the corresponding first and second determination conditions are selected according to the temperature range of the indoor ambient temperature to ensure the accuracy of the determination results.

If there is a refrigerant circulating in the air conditioner system during the cooling process, the real-time outlet air temperature of the indoor unit will be much lower than the indoor ambient temperature. With the gradual recovery of the refrigerant, the circulating refrigerant in the system becomes less and less. , the value of the real-time outlet air temperature of the indoor unit minus the initial outlet air temperature is getting larger and larger, and the value of the indoor ambient temperature minus the real-time outlet air temperature is getting smaller and smaller, that is, the real-time outlet air temperature is getting closer and closer to the indoor ambient temperature.

Please continue to refer to FIG. 1, further, the determination method may further include:

Step S102: Obtain the initial weight of the outdoor unit before the refrigerant recovery starts, and determine the third judgment condition according to the initial weight.

Please refer to FIG. 3. FIG. 3 shows a flowchart of a sub-step of step S102. Step S102 may include:

Sub-step S1021, obtain the initial weight of the outdoor unit before the refrigerant recovery starts.

In this embodiment, a weighing device is configured for the outdoor unit, and detection data of the weighing device before the start of refrigerant recovery is obtained to obtain the initial weight of the outdoor unit.

Sub-step S1022, compare the initial weight with a plurality of preset weight intervals.

In this embodiment, a plurality of preset weight intervals include: (-∞, 10kg], (10kg, 20kg], (20kg, 30kg], (30kg, 40kg] and (40kg, +∞).

Sub-step S1023, select a third determination condition corresponding to the weight interval in which the initial weight is located.

In the present embodiment, the third judgment condition corresponding to each weight interval is as follows:

In the table, the real-time weight refers to the real-time weight of the outdoor unit during the refrigerant recovery process.

For example, when the obtained initial weight is within the interval of (10kg, 20kg), the selected third judgment condition is: the ratio of the real-time weight of the outdoor unit minus the initial weight to the initial weight is less than or equal to 1%.

Please continue to refer to FIG. 1, further, the determination method may further include:

In step S103, the initial outlet air temperature of the indoor unit at the start of refrigerant recovery and the real-time outlet air temperature during the refrigerant recovery process are acquired.

In this embodiment, another temperature sensor package is installed on the indoor unit to detect the indoor outlet air temperature. Before the refrigerant recovery starts, the detection data of the temperature sensor package is received to obtain the initial outlet air temperature. Then, the detection data of the temperature sensing package is received in real time, and the real-time outlet air temperature is obtained.

Further, the determination method may also include:

Step S104, in the case that the indoor ambient temperature, the initial outlet air temperature and the real-time outlet air temperature satisfy the first determination condition, the indoor unit is controlled to reduce the wind speed.

Please refer to FIG. 4. FIG. 4 shows a flowchart of a sub-step of step S104. Step S104 may include:

Sub-step S1041, if the value of the real-time outlet air temperature minus the initial outlet air temperature is greater than or equal to the first preset value, and the value of the indoor ambient temperature minus the real-time outlet air temperature is less than or equal to the second preset value, control the indoor environment reduce the fan speed.

When the indoor ambient temperature is in different temperature ranges, the specific values of the first preset value and the second preset value are different, as shown in the preceding table. If the indoor ambient temperature is in the range of [50°C, +∞), the first preset value is 5, and the second preset value is 4; if the indoor ambient temperature is in the range of [40°C, 50°C), the first preset value is The preset value is 4, and the second preset value is 3; if the indoor ambient temperature is in the range of [30°C, 40°C), the first preset value is 3, and the second preset value is 2; In the range of [20°C, 30°C), the first preset value is 2, and the second preset value is 1.

During the normal cooling process of the air conditioner, if the fan speed of the indoor unit is reduced, the heat exchange of the evaporator will be reduced, and at this time, the real-time outlet air temperature of the indoor unit will be reduced.

Please continue to refer to FIG. 1, further, the determination method may further include:

Step S105, in the case that the real-time outlet air temperature before and after the reduction of the speed of the windshield meets the second determination condition, obtain the real-time weight of the outdoor unit.

It should be noted that in the process of obtaining the real-time weight of the outdoor unit, the refrigerant recovery process is still going on.

Please refer to FIG. 5. FIG. 5 shows a flowchart of a sub-step of step S105. Step S105 may include:

Sub-step S1051, if the value of the real-time outlet air temperature before the fan speed reduction minus the real-time outlet air temperature after the fan speed reduction is less than or equal to a third preset value, obtain the real-time weight of the outdoor unit.

When the indoor ambient temperature is in different temperature ranges, the specific value of the third preset value is different, as shown in the preceding table. If the indoor ambient temperature is in the [50°C, +∞) interval, the third preset value is 1; if the indoor ambient temperature is in the [40°C, 50°C) interval, the third preset value is 2; If the ambient temperature is within the range of [30°C, 40°C), the third preset value is 3; if the indoor ambient temperature is within the range of [20°C, 30°C), the third preset value is 4.

Please continue to refer to FIG. 1, further, the determination method may further include:

Step S106, in the case that the real-time weight and the initial weight satisfy the third determination condition, it is determined that the refrigerant recovery is completed.

If the real-time weight and the initial weight have not yet satisfied the third determination condition, the refrigerant recovery is continued. After it is determined that the recovery of the refrigerant is completed, the recovery of the refrigerant is controlled to end.

Please refer to FIG. 6. FIG. 6 shows a flowchart of a sub-step of step S106. Step S106 may include:

Sub-step S1061, if the ratio of the real-time weight minus the initial weight to the initial weight is less than or equal to the fourth preset value, it is determined that the refrigerant recovery is completed.

When the initial weight is in different weight ranges, the specific value of the fourth preset value is different, as shown in the preceding table. If the initial weight is within the interval of (-∞, 10kg], the fourth preset value is 0.5%; if the initial weight is within the interval of (10kg, 20kg], the fourth preset value is 1%; if the initial weight is within ( 20kg, 30kg] interval, the fourth preset value is 1.5%; if the initial weight is in the (30kg, 40kg] interval, the fourth preset value is 2%; if the initial weight is in the (40kg, +∞) interval , the fourth preset value is 2.5%.

Please refer to FIG. 7. FIG. 7 shows a block diagram of the structure of the device 100 for judging the completion of refrigerant recovery provided by the present embodiment. Multi-condition judgment is used to judge the completion of refrigerant recovery. Compared with the existing technology, the judgment result is more accurate and reliable. The apparatus 100 for judging the completion of refrigerant recovery provided in this embodiment includes: an acquisition module 110 , a control module 120 and a determination module 130 .

The acquisition module 110 is used to acquire the indoor ambient temperature, and determine the first determination condition and the second determination condition according to the indoor ambient temperature; the acquisition module 110 is also used to acquire the initial weight of the outdoor unit before the refrigerant recovery starts, and determine the first determination condition according to the initial weight. Three determination conditions; the obtaining module 110 is further configured to obtain the initial outlet air temperature of the indoor unit at the start of refrigerant recovery, and the real-time outlet air temperature during the refrigerant recovery process. It can be seen that the acquisition module 110 is used to execute steps S101, S102, S103, sub-steps S1011, sub-step S1012, sub-step S1013, sub-step S1021, sub-step S1022 and sub-step S1023 of the aforementioned method for judging the completion of refrigerant recovery.

The control module 120 is configured to control the indoor unit to reduce the rotational speed of the wind gear when the indoor ambient temperature, the initial outlet air temperature and the real-time outlet air temperature satisfy the first determination condition. The first determination condition includes: the value of the real-time outlet air temperature minus the initial outlet air temperature is greater than or equal to the first preset value, and the value of the indoor ambient temperature minus the real-time outlet air temperature is less than or equal to the second preset value.

It can be seen that the control module 120 is configured to execute step S104 and sub-step S1041 of the aforementioned method for judging the completion of refrigerant recovery.

The obtaining module 110 is further configured to obtain the real-time weight of the outdoor unit under the condition that the real-time outlet air temperature before and after the reduction of the wind speed speed meets the second determination condition. The second determination condition includes: the value of the real-time outlet air temperature before the speed reduction of the wind gear minus the real-time outlet air temperature after the reduction of the wind gear rotation speed is less than or equal to the third preset value.

It can be seen that the obtaining module 110 is further configured to perform step S105 and sub-step S1051 of the aforementioned method for judging the completion of refrigerant recovery.

The determination module 130 is configured to determine that the refrigerant recovery is completed when the real-time weight and the initial weight satisfy the third determination condition. The third determination condition includes: the ratio of the real-time weight minus the initial weight to the initial weight is less than or equal to a fourth preset value.

It can be seen that the determination module 130 is configured to execute step S106 and sub-step S1061 of the aforementioned method for determining the completion of refrigerant recovery.

This embodiment also provides an air conditioner, the air conditioner includes a controller, and the controller is configured to execute the method for determining the completion of refrigerant recovery in steps S101 to S106, and sub-steps corresponding to each step. It can be seen that the air conditioner provided in this embodiment judges the completion of the refrigerant recovery through multi-condition determination of multiple parameters before and after refrigerant recovery under different working conditions. Compared with the prior art, it is determined by a single pressure change. , the judgment result is more accurate and reliable.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the claims.

Claims (9)

1. A method for judging the completion condition of refrigerant recovery is applied to an air conditioner, and is characterized by comprising the following steps:

acquiring indoor environment temperature, and determining a first judgment condition and a second judgment condition according to the indoor environment temperature;

acquiring the initial weight of an outdoor unit before the start of refrigerant recovery, and determining a third judgment condition according to the initial weight;

acquiring an initial air outlet temperature of the indoor unit at the beginning of refrigerant recovery and a real-time air outlet temperature in the refrigerant recovery process;

under the condition that the indoor environment temperature, the initial air outlet temperature and the real-time air outlet temperature meet the first judgment condition, controlling the indoor unit to reduce the wind gear rotating speed;

acquiring the real-time weight of the outdoor unit under the condition that the real-time outlet air temperature before and after the reduction of the wind gear rotating speed meets the second judgment condition;

under the condition that the real-time weight and the initial weight meet the third judgment condition, judging that the refrigerant recovery is finished;

the step of controlling the indoor unit to reduce the wind gear rotating speed under the condition that the indoor environment temperature, the initial air-out temperature and the real-time air-out temperature meet the first judgment condition comprises the following steps:

and if the value obtained by subtracting the initial air-out temperature from the real-time air-out temperature is greater than or equal to a first preset value, and the value obtained by subtracting the real-time air-out temperature from the indoor environment temperature is less than or equal to a second preset value, controlling the indoor unit to reduce the wind gear rotating speed.

2. The method for determining completion of refrigerant recovery according to claim 1, wherein the step of obtaining an indoor ambient temperature and determining the first determination condition and the second determination condition according to the indoor ambient temperature includes:

acquiring the indoor environment temperature;

comparing the indoor environment temperature with a plurality of preset temperature intervals;

selecting the first determination condition and the second determination condition corresponding to the temperature interval in which the indoor environment temperature is located.

3. The method for determining whether refrigerant recovery is complete according to claim 1, wherein the step of obtaining an initial weight of the outdoor unit before refrigerant recovery starts and determining a third determination condition according to the initial weight comprises:

acquiring the initial weight of the outdoor unit before the refrigerant recovery starts;

comparing the initial weight with a plurality of preset weight intervals;

selecting the third determination condition corresponding to the weight interval in which the initial weight is located.

4. The method for determining whether refrigerant recovery is complete according to claim 1, wherein the step of obtaining the real-time weight of the outdoor unit when the real-time outlet air temperature before and after the reduction of the damper rotation speed satisfies the second determination condition comprises:

and if the value obtained by subtracting the real-time air outlet temperature after the reduction of the wind shield rotating speed from the real-time air outlet temperature before the reduction of the wind shield rotating speed is less than or equal to a third preset value, acquiring the real-time weight of the outdoor unit.

5. The method for determining completion of refrigerant recovery according to claim 1, wherein the step of determining completion of refrigerant recovery when the real-time weight and the initial weight satisfy the third determination condition includes:

and if the ratio of the value obtained by subtracting the initial weight from the real-time weight to the initial weight is less than or equal to a fourth preset value, judging that the refrigerant recovery is finished.

6. The device for judging the completion of refrigerant recovery is applied to an air conditioner, and is characterized in that the device (100) for judging the completion of refrigerant recovery comprises:

the device comprises an acquisition module (110) for acquiring the indoor environment temperature and determining a first judgment condition and a second judgment condition according to the indoor environment temperature; the acquisition module is further used for acquiring the initial weight of the outdoor unit before the refrigerant recovery starts and determining a third judgment condition according to the initial weight; the acquisition module is also used for acquiring the initial air outlet temperature of the indoor unit at the beginning of refrigerant recovery and the real-time air outlet temperature in the refrigerant recovery process;

a control module (120) configured to control the indoor unit to reduce a wind gear rotation speed when the indoor environment temperature, the initial air-out temperature, and the real-time air-out temperature meet the first determination condition, where the first determination condition includes: the value obtained by subtracting the initial outlet air temperature from the real-time outlet air temperature is greater than or equal to a first preset value, and the value obtained by subtracting the real-time outlet air temperature from the indoor environment temperature is less than or equal to a second preset value;

the obtaining module (110) is further configured to obtain a real-time weight of the outdoor unit when the real-time outlet air temperature before and after the reduction of the wind shield rotation speed meets the second determination condition;

and the judging module (130) is used for judging that the refrigerant recovery is finished under the condition that the real-time weight and the initial weight meet the third judging condition.

7. The apparatus for determining completion of refrigerant recovery according to claim 6, wherein the second determination condition includes:

and the value obtained by subtracting the real-time air outlet temperature after the reduction of the wind gear rotating speed from the real-time air outlet temperature before the reduction of the wind gear rotating speed is less than or equal to a third preset value.

8. The apparatus for determining completion of refrigerant recovery according to claim 6, wherein the third determination condition includes:

the ratio of the real-time weight minus the initial weight to the initial weight is less than or equal to a fourth preset value.

9. An air conditioner characterized by comprising a controller for executing the judgment method according to any one of claims 1 to 5.

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